diff --git a/ghc/compiler/main/CmdLineOpts.lhs b/ghc/compiler/main/CmdLineOpts.lhs
index c52b97b1e13ca1a814ec24412ad0d39cf497bd34..62b2e341d3ce9b04f5ab3beaa8845abc766af205 100644
--- a/ghc/compiler/main/CmdLineOpts.lhs
+++ b/ghc/compiler/main/CmdLineOpts.lhs
@@ -93,6 +93,7 @@ module CmdLineOpts (
 	opt_WarnUnusedNames,
 	opt_WarnIncompletePatterns, opt_WarnOverlappedPatterns,
 	opt_WarnMissingMethods,
+	opt_WarnDuplicateExports,
 	opt_PruneTyDecls, opt_PruneInstDecls,
 	opt_D_show_unused_imports,
 	opt_D_show_rn_stats,
@@ -351,6 +352,7 @@ opt_WarnIncompletePatterns	= lookUp  SLIT("-fwarn-incomplete-patterns")
 opt_WarnOverlappedPatterns	= lookUp  SLIT("-fwarn-overlapped-patterns")
 opt_WarnUnusedNames		= lookUp  SLIT("-fwarn-unused-names")
 opt_WarnMissingMethods		= lookUp  SLIT("-fwarn-missing-methods")
+opt_WarnDuplicateExports	= lookUp  SLIT("-fwarn-duplicate-exports")
 opt_PruneTyDecls		= not (lookUp SLIT("-fno-prune-tydecls"))
 opt_PruneInstDecls		= not (lookUp SLIT("-fno-prune-instdecls"))
 opt_D_show_unused_imports	= lookUp SLIT("-dshow-unused-imports")